Any Leaf Spring Technicians out there?

Submitted: Sunday, Mar 22, 2015 at 18:51
ThreadID: 117178 Views:3286 Replies:6 FollowUps:8
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Question for the knowledge bank...

I am building a light duty on-road trailer similar in design to an Ezy Trailer folding trailer. I have an issue with the leaf springs.

I have come into the possession of a pair of new trailer type leaf springs which the previous owner had no use for and didn't mind me obtaining them (true!). The trailer they would have been used for is a dual axle and rated at 1500kg loaded, hence the springs are safe for 750kg per pair, perfect! BUT they are as stiff as anything! Crazy stiff. Rock hard. Hard enough that their stiffness and the usual bouncing on the road may damage the folding parts.

They are four leaves. No 1 is the top leaf, eye to eye. No 2 is shorter, No 3 shorter still and with the riveted clamp devices, and No 4 is the shortest leaf and is retained with the centre bolt. I have replaced this bolt and removed (but kept) No 4 leaf. Leaves are about 5mm thick and the spring is 50mm wide.

My question is, what leaves should I remove to soften the spring pack? Reducing the capacity isn't a problem, the trailer won't be rated to 750kg loaded when I comply it.

I can safely dismantle the remaining leaves at work without damaging the heat treatment of the leaves.
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